Viso was a Council Minister from Galacia who was male and served loyally under both King Cana and Queen Veda. Over the years, he lost his sight, yet he still navigated the palace with ease, frequently walking through the royal gardens. Moreover, he possessed knowledge of Cana's hidden history, which he learned shortly before the King's passing.
During the gubernatorial election that took place in 44 BBY, Visa disclosed all of this information to Cana's son, Prince Beju. This occurred after the elderly Galacian intervened to halt a duel that was taking place between the Prince and Jedi Padawan Obi-Wan Kenobi. Viso then arranged for Beju to undergo the Mark of the Crown test, which, as Viso anticipated, yielded a negative result. Beju's half-sister, Elan, was in fact the legitimate heir to the throne.